Test platform of battery management system

Abstract

The utility model relates to a test platform of a battery management system, which comprises a battery simulator, a test board and a high-voltage control box, the test board is provided with a power supply and wake-up function test module, an external output signal test module, a relay control and fault simulation detection module, a battery voltage acquisition and battery fault simulation module, a cell temperature simulation module, an insulation simulation module and a current detection simulation module. The battery simulator is connected with the high-voltage control box, the battery voltage acquisition and battery fault simulation module and the insulation simulation module; the power supply and wake-up function test module, the external output signal test module, the relay control and fault simulation detection module, the battery voltage acquisition and battery fault simulation module, the cell temperature simulation module and the insulation simulation module are connected with corresponding interfaces on a to-be-tested battery management system. The battery management system can be automatically adjusted according to different functional requirements, the test difficulty of the battery management system is reduced, and the test period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management system testing, in particular to a battery management system testing platform. Background Art

[0002] The battery management system (BMS) is an important link between the on-board power battery and the electric vehicle. BMS collects, processes, and stores important information during the operation of the battery pack in real time. Exchanging information with the vehicle controller can solve key issues such as safety, availability, and service life in the lithium battery system. Exchanging information with the charger can solve problems such as safety and rechargeability during the charging process of the lithium battery. The main function of the battery management system is to improve the utilization rate of the battery, prevent overcharging and over-discharging of the battery, extend the service life of the battery, and monitor the status of the battery. Therefore, the necessity and importance of testing the functions of the BMS are self-evident. For this reason, a comprehensive test platform for the battery management system is urgently needed. Summary of the invention

[0003] The utility model provides a test platform for a battery management system, which can perform functional tests on the battery management system, shorten the test cycle of the battery management system and save human resources; the test platform can also be adjusted according to demand, making it easy for testers to use.

[0004] The technical solution of the utility model is as follows: a test platform for a battery management system, comprising: a battery simulator, a test board and a high-voltage control box, wherein the test board is provided with a power supply and wake-up function test module, an external output signal test module, a relay control and fault simulation detection module, a battery voltage acquisition and battery fault simulation module, a battery core temperature simulation module, an insulation simulation module and a current detection simulation module;

[0005] The battery simulator is respectively connected to the high-voltage control box, the battery voltage acquisition and battery fault simulation module, and the insulation simulation module; the power supply and wake-up function test module, the external output signal test module, the relay control and fault simulation detection module, the battery voltage acquisition and battery fault simulation module, the battery cell temperature simulation module, and the insulation simulation module are all connected to the corresponding interfaces on the battery management system to be tested;

[0006] The current detection interface of the high-voltage control box is connected to the input end of the current detection simulation module, and the output end of the current detection simulation module is connected to the corresponding interface on the battery management system to be tested;

[0007] The power supply and wake-up function test module is used to provide the battery management system under test with a power supply voltage and a charging wake-up signal, an ignition wake-up signal and a smoke wake-up signal required to trigger the wake-up function;

[0008] The external output signal test module is used to detect the smoke sensing enable signal and the high-voltage interlock signal output by the battery management system to be tested;

[0009] The relay control and fault simulation detection module is used to detect the relay control signal and provide the fault signal of abnormal closing and abnormal opening of the relay;

[0010] The battery voltage acquisition and battery fault simulation module is used to provide voltage signals of multiple groups of single cells and provide fault signals of short circuit and open circuit of single cells;

[0011] The battery cell temperature simulation module is used to provide a battery cell temperature signal for the battery management system to be tested;

[0012] The insulation simulation module is used to provide the battery management system to be tested with signals for detecting the positive and negative electrodes relative to the ground.

[0013] Further, the power supply and wake-up function test module includes: an external input voltage, a first switch S1, a second switch S2, a charging wake-up indicator LED1, an ignition wake-up indicator LED2, and a smoke wake-up indicator LED3;

[0014] The external input voltage is connected to the power supply interface of the battery management system to be tested, the common contact of the first switch S1 and the common contact of the second switch S2, one switch contact of the first switch S1 is connected to the charging wake-up interface of the battery management system to be tested and one end of the charging wake-up indicator LED1, and the other end of the charging wake-up indicator LED1 is connected to the signal ground;

[0015] Another switch contact of the first switch S1 is connected to the ignition wake-up interface of the battery management system to be tested and one end of the ignition wake-up indicator LED2, and the other end of the ignition wake-up indicator LED2 is connected to the signal ground;

[0016] A switch contact of the second switch S2 is connected to the smoke wake-up interface of the battery management system to be tested and one end of the smoke wake-up indicator LED3, and the other end of the smoke wake-up indicator LED3 is connected to the signal ground.

[0017] Furthermore, a current detection device is connected in series between the external input voltage and the power supply interface of the battery management system to be tested.

[0018] Further, the external output signal test module includes a high-voltage interlock fault simulation switch S3, a smoke output detection switch S4, a smoke signal indicator LED4 and an interlock signal indicator LED5, the common contact of the high-voltage interlock fault simulation switch S3 is connected to the interlock signal output interface of the battery management system to be tested, the switch contact of the high-voltage interlock fault simulation switch S3 is connected to the interlock signal receiving interface of the battery management system to be tested and one end of the interlock signal indicator LED5, and the other end of the interlock signal indicator LED5 is connected to the signal ground;

[0019] The common contact of the smoke output detection switch S4 is connected to the smoke output interface of the battery management system to be tested, the switch contact of the smoke output detection switch S4 is connected to one end of the smoke signal indicator LED4, and the other end of the smoke signal indicator LED4 is connected to the signal ground.

[0020] Furthermore, the relay control and fault simulation detection module includes multiple groups of relay detection branches, each group of relay detection branches corresponds to different relays, and each group of relay detection branches includes: a relay disconnection abnormal simulation switch, a relay closing abnormal simulation switch and a display indicator light, the common contact of the relay disconnection abnormal simulation switch is connected to the relay working voltage, the switch contact of the relay disconnection abnormal simulation switch is connected to one end of the display indicator light and the relay detection interface of the battery management system to be tested, the common contact of the relay closing abnormal simulation switch is connected to the relay control interface, the switch contact of the relay closing abnormal simulation switch is connected to one end of the display indicator light and the relay detection interface of the battery management system to be tested, and the other end of the display indicator light is connected to the signal ground.

[0021] Furthermore, the relay detection branches are provided with 4 groups, and the 4 groups of relay detection branches correspond to the positive relay, the negative relay, the pre-charging relay and the heating relay respectively.

[0022] Furthermore, the battery voltage acquisition and battery fault simulation module includes multiple groups of multi-channel single cell voltage acquisition circuits, the common contacts of the multi-channel single cell voltage acquisition circuits are connected to the battery simulator, the switch contacts of the multi-channel single cell voltage acquisition circuits are connected to the voltage acquisition interface of the battery management system to be tested, and a battery string open circuit simulation switch is connected in series on one channel of each group of the multi-channel single cell voltage acquisition circuits, and a battery string short circuit simulation switch is connected between any two adjacent channels.

[0023] Furthermore, the battery cell temperature simulation module includes: multiple temperature simulation switches, the common contact of each temperature simulation switch is connected to the temperature detection interface of the battery management system to be tested, and the switch contacts of each temperature simulation switch are respectively connected to temperature simulation resistors with different resistance values.

[0024] Furthermore, the insulation simulation module includes multiple insulation simulation switches, the common contacts of each insulation simulation switch are respectively connected to the positive pole of the battery simulator or the insulation detection interface of the battery management system to be tested, the switch contacts of each insulation simulation switch are respectively connected to insulation simulation resistors of different resistance values, and the other end of each insulation simulation resistor connected to the insulation simulation switch is connected to the signal ground.

[0025] Furthermore, the current detection simulation module includes two current direction control switches and two fuses, the two switch contacts of the two current direction control switches are respectively connected to the positive detection current and the negative detection current, the common contacts of the two current direction control switches are respectively connected to one end of the fuse, and the other end of the fuse is connected to the current detection interface of the battery management system to be tested.

[0026] Beneficial effects of the utility model: The utility model can realize low-voltage power supply and wake-up detection function, high-voltage interlock signal and smoke signal detection function, relay control and fault simulation detection function, single cell voltage simulation and fault detection function, battery cell temperature simulation and fault detection function, insulation simulation detection function, current detection control function, high-voltage detection and fault simulation function, simple to use, good compatibility, the test platform can verify the BMS software strategy and detect and diagnose possible faults, ensuring the safety of the power battery during charging and discharging. The utility model realizes comprehensive testing, is simple to use, low cost, can be adjusted according to different functional requirements, reduces the difficulty of battery management system testing, and shortens the test cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural frame diagram of the utility model.

[0028] Figure 2 It is a circuit diagram of a power supply and wake-up function test module in the utility model.

[0029] Figure 3 It is a circuit diagram of an external output signal test module in the utility model.

[0030] Figure 4 It is a circuit diagram of a relay control and fault simulation detection module in the utility model.

[0031] Figure 5 It is a circuit diagram of a battery voltage acquisition and battery fault simulation module in the utility model.

[0032] Figure 6 It is a circuit diagram of the battery core temperature simulation module in the utility model.

[0033] Figure 7 It is a circuit diagram of the insulation simulation module in the utility model.

[0034] Figure 8 It is a circuit diagram of the current detection simulation module in the utility model. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. The described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0036] In an embodiment of the present utility model, Figure 1 It is a structural schematic diagram provided according to the specific structure of a test platform of a battery management system of the utility model, such as Figure 1 As shown, the utility model specifically includes:

[0037] A battery simulator 1, a test board 2 and a high-voltage control box 3, wherein the test board 2 is provided with a power supply and wake-up function test module 21, an external output signal test module 22, a relay control and fault simulation detection module 23, a battery voltage acquisition and battery fault simulation module 24, a battery cell temperature simulation module 25, an insulation simulation module 27 and a current detection simulation module 26.

[0038] The battery simulator 1 is respectively connected to the high-voltage control box 3, the battery voltage acquisition and battery fault simulation module 24, and the insulation simulation module 27; the power supply and wake-up function test module 21, the external output signal test module 22, the relay control and fault simulation detection module 23, the battery voltage acquisition and battery fault simulation module 24, the battery cell temperature simulation module 25, and the insulation simulation module 27 are all connected to the corresponding interfaces on the battery management system 4 to be tested;

[0039] The current detection interface of the high-voltage control box 3 is connected to the input end of the current detection simulation module 26, and the output end of the current detection simulation module 26 is connected to the corresponding interface on the battery management system 4 to be tested, wherein the high-voltage control box needs to be connected to the analog current source 5 to provide an analog current signal during current detection.

[0040] The power supply and wake-up function test module 21 is used to provide the battery management system 4 under test with power supply voltage and the charging wake-up signal, ignition wake-up signal and smoke wake-up signal required to trigger the wake-up function. The external output signal test module 22 is used to detect the smoke enable signal and high-voltage interlock signal output by the battery management system 4 under test. The relay control and fault simulation detection module 23 is used to detect the relay control signal and provide fault signals of abnormal relay closure and abnormal disconnection. The battery voltage acquisition and battery fault simulation module 24 is used to provide voltage signals of multiple groups of single cells and provide fault signals of short circuit and open circuit of single cells. The battery cell temperature simulation module 25 is used to provide battery cell temperature signals for the battery management system 4 under test. The insulation simulation module 27 is used to provide the battery management system 4 under test with signals for positive and negative pole ground detection.

[0041] By sending different analog signals to the battery management system 4 to be tested, observing the output level, output message and control situation of the high-voltage control box of the battery management system 4 to be tested, the strategy of the battery management system 4 to be tested is comprehensively judged and verified, software vulnerabilities are discovered in time, and the safety in actual application is ensured, thereby ensuring the normal operation of the battery management system.

[0042] like Figure 2 As shown, the power supply and wake-up function test module 21 specifically includes an external input voltage, a first switch S1, a second switch S2, a charging wake-up indicator LED1, an ignition wake-up indicator LED2, and a smoke wake-up indicator LED3. Among them, the external input voltage is a 12V DC voltage, and the first switch S1 and the second switch S2 are both multi-position switches. The external input voltage connects the power supply interface of the battery management system 4 to be tested, the common contact of the first switch S1, and the common contact of the second switch S2.

[0043] The external input voltage is connected to the power supply interface of the battery management system 4 to be tested to provide a 12V working voltage for the battery management system 4 to be tested. In order to monitor whether the external input voltage is stable, a current detection device can be connected in series between the external input voltage and the power supply interface of the battery management system 4 to be tested. The current detection device is generally an ammeter or a multimeter.

[0044] A switch contact of the first switch S1 is connected to the charging wake-up interface of the battery management system 4 to be tested and one end of the charging wake-up indicator LED1, and the other end of the charging wake-up indicator LED1 is connected to the signal ground. Among them, a switch contact of the first switch S1 is connected to the resistor R1, and a charging wake-up signal is provided to the battery management system 4 to be tested through the resistor R1. The charging wake-up indicator LED1 is used to indicate whether the charging wake-up branch is connected, and the charging wake-up indicator LED1 is connected to the resistor R3.

[0045] Another switch contact of the first switch S1 is connected to the ignition wake-up interface of the battery management system 4 to be tested and one end of the ignition wake-up indicator LED2, and the other end of the ignition wake-up indicator LED2 is connected to the signal ground. Among them, another switch contact of the first switch S1 is connected to the resistor R1, and the ignition wake-up signal is provided to the battery management system 4 to be tested through the resistor R1. The ignition wake-up indicator LED2 is used to indicate whether the ignition wake-up branch is connected, and the indicator LED2 is connected to the resistor R4.

[0046] A switch contact of the second switch S2 is connected to the smoke wake-up interface of the battery management system 4 to be tested and one end of the smoke wake-up indicator LED3, and the other end of the smoke wake-up indicator LED3 is connected to the signal ground. Among them, a switch contact of the second switch S2 is connected to the resistor R2, and the smoke wake-up signal is provided to the battery management system 4 to be tested through the resistor R2. The smoke wake-up indicator LED3 is used to indicate whether the smoke wake-up branch is connected, and the smoke wake-up indicator LED3 is connected to the resistor R5.

[0047] The power supply and wake-up function test module 21 uses two 3-pin 3-speed switches as the control switches of the wake-up signal. When the switch is in the middle gear, the wake-up branch is not connected to the 12V external voltage. When the switch is turned to pin 2 or 3, the wake-up branch is not connected to the 12V external voltage, and a corresponding wake-up signal is provided. The indicator light at the rear end of the switch can intuitively check whether the wake-up branch is connected to the 12V external voltage. When a wake-up branch is connected, check whether the battery management system 4 to be tested is awakened, thereby confirming whether the wake-up function of the battery management system 4 to be tested is normal.

[0048] like Figure 3 As shown, the external output signal test module 22 includes a high-voltage interlock fault simulation switch S3, a smoke output detection switch S4, a smoke signal indicator LED4 and an interlock signal indicator LED5. The common contact of the high-voltage interlock fault simulation switch S3 is connected to the interlock signal output interface of the battery management system 4 to be tested, the switch contact of the high-voltage interlock fault simulation switch S3 is connected to the interlock signal receiving interface of the battery management system 4 to be tested and one end of the interlock signal indicator LED5, and the other end of the interlock signal indicator LED5 is connected to the signal ground. The common contact of the smoke output detection switch S4 is connected to the smoke output interface of the battery management system 4 to be tested, the switch contact of the smoke output detection switch S4 is connected to one end of the smoke signal indicator LED4, and the other end of the smoke signal indicator LED4 is connected to the signal ground.

[0049] The principle of high-voltage interlock detection is to output a 12V signal from the BMS through the interlock pin on the connector and then transmit the 12V signal back to the BMS. Then the BMS collects the high-level signal to determine whether the high-voltage interlock is normal. In this circuit, the high-voltage interlock fault simulation switch S3 is used to simulate the situation where the connector is not connected. Closing the high-voltage interlock fault simulation switch S3 means that the interlock circuit is connected. At this time, the interlock signal indicator LED5 is on. Disconnect the high-voltage interlock fault simulation switch S3, and the interlock signal indicator LED5 goes out, indicating that the high-voltage interlock circuit is disconnected. At this time, observe whether the high-voltage interlock signal output in the CAN message is abnormal, so as to determine whether the high-voltage interlock function is normal. The smoke sensor enable signal is judged by the smoke sensor signal indicator LED4. Observe the lighting of the smoke sensor signal indicator LED4 to determine whether the smoke sensor enable signal is output.

[0050] like Figure 4 As shown, the relay control and fault simulation detection module 23 includes multiple groups of relay detection branches, each group of relay detection branches corresponds to different relays, and each group of relay detection branches includes: a relay disconnection abnormal simulation switch, a relay closing abnormal simulation switch and a display indicator light, the common contact of the relay disconnection abnormal simulation switch is connected to the relay working voltage, the switch contact of the relay disconnection abnormal simulation switch is connected to one end of the display indicator light and the relay detection interface of the battery management system 4 to be tested, the common contact of the relay closing abnormal simulation switch is connected to the relay control interface, the switch contact of the relay closing abnormal simulation switch is connected to one end of the display indicator light and the relay detection interface of the battery management system 4 to be tested, and the other end of the display indicator light is connected to the signal ground.

[0051] Specifically, the relay detection branches are provided with 4 groups, and the 4 groups of relay detection branches correspond to the positive relay, the negative relay, the pre-charging relay and the heating relay respectively.

[0052] The normal closing of the relay is automatically controlled by the BMS, and the purpose of closing the main contacts of the high-voltage circuit is achieved by closing the relay coil. When the BMS sends a relay control signal, the display indicator in the module lights up, indicating that the relay is working normally. By manually operating the relay disconnection abnormal simulation switch and the relay closing abnormal simulation switch, the relay coil failure can be simulated, and by observing whether the BMS makes corresponding emergency actions, it can be judged whether the BMS function is normal. Connecting the relay pins on the BMS to the test board through the connector and adding the corresponding fault simulation switch and light display can enable testers to reproduce and observe fault simulation more intuitively.

[0053] like Figure 5As shown, the battery voltage acquisition and battery fault simulation module 24 includes multiple groups of multi-channel single cell voltage acquisition circuits, the common contacts of the multi-channel single cell voltage acquisition circuits are connected to the battery simulator, the switch contacts of the multi-channel single cell voltage acquisition circuits are connected to the voltage acquisition interface of the battery management system 4 to be tested, and a battery string open circuit simulation switch is connected in series on one channel of each group of the multi-channel single cell voltage acquisition circuits, and a battery string short circuit simulation switch is connected between any two adjacent channels.

[0054] Among them, the multi-channel single cell voltage acquisition circuit can be 14 strings of channels, and specifically three groups of identical multi-channel single cell voltage acquisition circuits can be set to achieve the simulation of measuring the voltage of up to 42 strings of single cells. When working, an external battery simulator is required as the voltage source input. A 2-pin jumper is added to the battery on each channel of the single cell voltage acquisition circuit, which can facilitate the series operation of the battery and the adjustment of the number of battery strings. By closing the battery string disconnection simulation switch and the battery string short circuit simulation switch, the battery string disconnection and short circuit are simulated. By observing the control action of the BMS on the high-voltage control box and the output message, it is confirmed whether the function in the BMS is normal.

[0055] like Figure 6 As shown, the battery cell temperature simulation module 25 includes: multiple temperature simulation switches, the common contacts of each temperature simulation switch are connected to the temperature detection interface of the battery management system 4 to be tested, and the switch contacts of each temperature simulation switch are respectively connected to temperature simulation resistors with different resistance values. The design principle of the battery cell temperature simulation module is to connect a fixed voltage in series in the temperature detection circuit instead of the thermistor, and read the voltage value on both sides of the resistor in the temperature detection circuit inside the BMS to calculate the corresponding temperature. To this end, the battery cell temperature simulation module can be set with 23 switches, a total of 46 temperature points, and the temperature range covers -40~125℃, and the appropriate temperature value is selected according to the test function. It should be noted that two temperature simulation switches cannot be closed at the same time, otherwise the temperature value will change and be inconsistent with the temperature to be simulated. Figure 5 , a schematic diagram of a temperature simulation switch.

[0056] like Figure 7As shown, the insulation simulation module 27 includes a plurality of insulation simulation switches, each of which has a common contact connected to the positive electrode of the battery simulator or the insulation detection interface of the battery management system 4 to be tested, and each group of switch contacts of the insulation simulation switches are connected to insulation simulation resistors of different resistance values, and the other end of each insulation simulation resistor connected to the insulation simulation switch is connected to the signal ground. The principle of the insulation simulation detection circuit is to connect a fixed value resistor in series between the positive or negative electrode of the battery pack and the ground. The BMS determines whether the battery pack is in an abnormal insulation state by the insulation resistance value, thereby alarming or cutting off the relay operation. Eight fixed-value resistors are connected between the positive and negative poles of the insulation simulation module, and are respectively connected in series in the positive-to-ground or negative-to-ground loop by switch control. The insulation simulation switch is a 3-pin 3-speed switch. When the switch is placed at pin 1, the insulation resistance is not incorporated into the insulation detection loop, and the battery pack resistance cannot be detected at this time. When the switch is placed at pins 2 or 3, the corresponding insulation resistance is incorporated into the insulation detection loop, and the corresponding insulation resistance can be measured at this time. By connecting different insulation resistances to the insulation detection interface, different resistances to ground are simulated, and the on-off status of the relay of the high-voltage control box is observed to make a judgment on the function test.

[0057] like Figure 8 As shown, the current detection simulation module 26 includes two current direction control switches and two fuses. The two switch contacts of the two current direction control switches are respectively connected to the positive detection current and the negative detection current. The common contacts of the two current direction control switches are respectively connected to one end of the fuse, and the other end of the fuse is connected to the current detection interface of the battery management system 4 to be tested.

[0058] The purpose of adding two 3-pin 2-speed current direction control switches to this module is to facilitate the switching of charging and discharging currents. When both switches are placed at pin 2, it is the discharging process, and when both switches are placed at pin 3 at the same time, it is the charging process. This module is used to simulate different current flows during battery charging and discharging. The judgment of performing this function test is determined by observing the action of the BMS during the charging and discharging detection process.

[0059] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A test platform for a battery management system, characterized in that: include: A battery simulator (1), a test board (2) and a high-voltage control box (3), wherein the test board (2) is provided with a power supply and wake-up function test module (21), an external output signal test module (22), a relay control and fault simulation detection module (23), a battery voltage collection and battery fault simulation module (24), a battery cell temperature simulation module (25), an insulation simulation module (27) and a current detection simulation module (26); The battery simulator (1) is respectively connected to the high-voltage control box (3), the battery voltage acquisition and battery fault simulation module (24), and the insulation simulation module (27); the power supply and wake-up function test module (21), the external output signal test module (22), the relay control and fault simulation detection module (23), the battery voltage acquisition and battery fault simulation module (24), the battery cell temperature simulation module (25), and the insulation simulation module (27) are all connected to corresponding interfaces on the battery management system (4) to be tested; The current detection interface of the high-voltage control box (3) is connected to the input end of the current detection simulation module (26), and the output end of the current detection simulation module (26) is connected to the corresponding interface on the battery management system (4) to be tested; The power supply and wake-up function test module (21) is used to provide the battery management system (4) under test with a power supply voltage and a charging wake-up signal, an ignition wake-up signal and a smoke wake-up signal required to trigger a wake-up function; The external output signal test module (22) is used to detect the smoke sensing enable signal and the high-voltage interlock signal output by the battery management system (4) to be tested; The relay control and fault simulation detection module (23) is used to detect the relay control signal and provide a fault signal of abnormal closing and abnormal opening of the relay; The battery voltage collection and battery fault simulation module (24) is used to provide voltage signals of multiple groups of single cells and provide fault signals of short circuit and open circuit of single cells; The battery cell temperature simulation module (25) is used to provide a battery cell temperature signal for the battery management system (4) to be tested; The insulation simulation module (27) is used to provide the battery management system (4) to be tested with signals for detecting the positive electrode and the negative electrode relative to the ground.

2. The test platform for the battery management system according to claim 1, characterized in that: The power supply and wake-up function test module (21) comprises: an external input voltage, a first switch S1, a second switch S2, a charging wake-up indicator LED1, an ignition wake-up indicator LED2, and a smoke wake-up indicator LED3; The external input voltage is connected to a power supply interface of the battery management system (4) to be tested, a common contact of a first switch S1 and a common contact of a second switch S2, a switch contact of the first switch S1 is connected to a charging wake-up interface of the battery management system (4) to be tested and one end of a charging wake-up indicator LED1, and the other end of the charging wake-up indicator LED1 is connected to a signal ground; Another switch contact of the first switch S1 is connected to an ignition wake-up interface of the battery management system (4) to be tested and one end of an ignition wake-up indicator LED2, and the other end of the ignition wake-up indicator LED2 is connected to a signal ground; A switch contact of the second switch S2 is connected to the smoke wake-up interface of the battery management system (4) to be tested and one end of the smoke wake-up indicator LED3, and the other end of the smoke wake-up indicator LED3 is connected to the signal ground.

3. The test platform for the battery management system according to claim 2, characterized in that: A current detection device is connected in series between the external input voltage and the power supply interface of the battery management system (4) to be tested.

4. The test platform for the battery management system according to claim 1, characterized in that: The external output signal test module (22) comprises a high-voltage interlock fault simulation switch S3, a smoke output detection switch S4, a smoke signal indicator LED4 and an interlock signal indicator LED5, the common contact of the high-voltage interlock fault simulation switch S3 is connected to the interlock signal output interface of the battery management system (4) to be tested, the switch contact of the high-voltage interlock fault simulation switch S3 is connected to the interlock signal receiving interface of the battery management system (4) to be tested and one end of the interlock signal indicator LED5, and the other end of the interlock signal indicator LED5 is connected to a signal ground; The common contact of the smoke output detection switch S4 is connected to the smoke output interface of the battery management system (4) to be tested, the switch contact of the smoke output detection switch S4 is connected to one end of the smoke signal indicator LED4, and the other end of the smoke signal indicator LED4 is connected to the signal ground.

5. The test platform for the battery management system according to claim 1, characterized in that: The relay control and fault simulation detection module (23) comprises a plurality of relay detection branches, each relay detection branch corresponds to a different relay, each relay detection branch comprises: a relay disconnection abnormal simulation switch, a relay closing abnormal simulation switch and a display indicator light, the common contact of the relay disconnection abnormal simulation switch is connected to the relay working voltage, the switch contact of the relay disconnection abnormal simulation switch is connected to one end of the display indicator light and the relay detection interface of the battery management system (4) to be tested, the common contact of the relay closing abnormal simulation switch is connected to the relay control interface, the switch contact of the relay closing abnormal simulation switch is connected to one end of the display indicator light and the relay detection interface of the battery management system (4) to be tested, and the other end of the display indicator light is connected to the signal ground.

6. The test platform for the battery management system according to claim 5, characterized in that: The relay detection branches are provided with 4 groups, and the 4 groups of relay detection branches correspond to the positive relay, the negative relay, the pre-charging relay and the heating relay respectively.

7. The test platform for the battery management system according to claim 1, characterized in that: The battery voltage acquisition and battery fault simulation module (24) comprises a plurality of groups of multi-channel single cell voltage acquisition circuits, the common contacts of the multi-channel single cell voltage acquisition circuits being connected to a battery simulator, the switch contacts of the multi-channel single cell voltage acquisition circuits being connected to a voltage acquisition interface of a battery management system (4) to be tested, a battery string disconnection simulation switch being connected in series on one channel of each group of the multi-channel single cell voltage acquisition circuits, and a battery string short circuit simulation switch being connected between any two adjacent channels.

8. The test platform for the battery management system according to claim 1, characterized in that: The battery cell temperature simulation module (25) comprises: a plurality of temperature simulation switches, the common contact of each temperature simulation switch being connected to the temperature detection interface of the battery management system (4) to be tested, and the switch contacts of each temperature simulation switch being respectively connected to temperature simulation resistors of different resistance values.

9. The test platform for a battery management system according to claim 1, characterized in that: The insulation simulation module (27) comprises a plurality of insulation simulation switches, wherein the common contact of each insulation simulation switch is respectively connected to the positive electrode of the battery simulator or the insulation detection interface of the battery management system (4) to be tested, and the switch contact of each insulation simulation switch is respectively connected to insulation simulation resistors of different resistance values, and the other end of each insulation simulation resistor connected to the insulation simulation switch is connected to a signal ground.

10. The test platform for a battery management system according to claim 1, characterized in that: The current detection simulation module (26) comprises two current direction control switches and two fuses, wherein two switch contacts of the two current direction control switches are respectively connected to a positive detection current and a negative detection current, and common contacts of the two current direction control switches are respectively connected to one end of the fuse, and the other end of the fuse is connected to a current detection interface of the battery management system (4) to be tested.

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